There is nothing remotely senile or bluff about it, he knows exactly what he's doing.
Reminds me of a bunch of people betting on horses.
"Will he try to outmaneuver the one in front??"
"Oh, he's calculating his maximum speed against the distance separating them!!"
"He will try to use his velocity to throw off the center of gravity!"
"He seemed to be aiming for calculated approach, but to everyone's surprise, he didn't take the opportunity."
Guys, it's a horse. He runs, he eats, he sleeps.
Not saying Biden is a horse, but to imply profound genius in his choice of words when it's been years since he spoke a coherent paragraph without gaffing, it's a little more than I'm going to concede to right now.